A study of interpolation method in diagnosis of carpal tunnel syndrome

Annals of Indian Academy of Neurology
Alireza AshrafMaryam Fakheri

Abstract

The low correlation between the patients' signs and symptoms of carpal tunnel syndrome (CTS) and results of electrodiagnostic tests makes the diagnosis challenging in mild cases. Interpolation is a mathematical method for finding median nerve conduction velocity (NCV) exactly at carpal tunnel site. Therefore, it may be helpful in diagnosis of CTS in patients with equivocal test results. The aim of this study is to evaluate interpolation method as a CTS diagnostic test. Patients with two or more clinical symptoms and signs of CTS in a median nerve territory with 3.5 ms ≤ distal median sensory latency <4.6 ms from those who came to our electrodiagnostic clinics and also, age matched healthy control subjects were recruited in the study. Median compound motor action potential and median sensory nerve action potential latencies were measured by a MEDLEC SYNERGY VIASIS electromyography and conduction velocities were calculated by both routine method and interpolation technique. Chi-square and Student's t-test were used for comparing group differences. Cut-off points were calculated using receiver operating characteristic curve. A sensitivity of 88%, specificity of 67%, positive predictive value (PPV) and negative predictive value (NP...Continue Reading

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Citations

Jun 3, 2014·Daru : Journal of Faculty of Pharmacy, Tehran University of Medical Sciences·Mohammad Hashem HashempurMojtaba Heydari
Nov 18, 2015·Complementary Therapies in Clinical Practice·Mohammad Hashem HashempurArman Zargaran
Dec 3, 2016·Journal of Evidence-based Complementary & Alternative Medicine·Mohammad SetayeshHossein Rezaeizadeh

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